Recently, the pandemic of COVID-19 has highlighted the necessity
and effectiveness of unknown disease peak control.
Since it may take up to several years to develop and supply
vaccines sufficiently broadly [1]},
a large ratio of population may become infected simultaneously,
which would cause huge pressure to hospitals and medical sectors.
Initial measures such as keeping social distance and avoiding
unnecessary gatherings are introduced to slow down the
disease spreading. By temporarily reducing contacts
with others at proper periods, peaks can be
reduced in frequency and the number of infected patients.
Recent studies related to theoretical studies on
peak control can be found in, e.g, [2]}, [3]}.
